.index-about-box{
    width: 100%;
    display: block;
    position: relative;
    overflow: hidden;
    box-sizing: border-box;
    padding: 100px 0;
    font-size: 0;
}
.index-about-img{
    width: calc((1000 / 1920) * 100vw);
    height: calc((800 / 1000) * ((1000 / 1920) * 100vw));
    display: inline-block;
    vertical-align: middle;
    position: relative;
    z-index: 1;
}
.index-about-text-box{
    width: calc(100% - ((1000 / 1920) * 100vw));
    display: inline-block;
    vertical-align: middle;
    box-sizing: border-box;
    padding: 0 50px;
    position: relative;
    z-index: 1;
}
.index-about-text{
    font-family: "Noto Sans TC";
    font-size: 18px;
    color: #666;
    letter-spacing: 0.06em;
    line-height: 2;
    margin-top: 35px;
}
.index-about-text span{
    font-weight: 700;
    color: #000;
}
.index-about-text p{
    font-size: 20px;
}
.index-about-bg{
    width: calc((1200 / 1920) * 100vw);
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;
    background-color: #fafafa;
    display: block;
}


@media only screen and (max-width: 1000px){
    .index-about-text-box{
        padding: 0 30px;
    }
    .index-about-text{
        line-height: 1.4;
        margin-top: 20px;
    }
}
@media only screen and (max-width: 768px){
    .index-about-box{
        width: 550px;
        max-width: 100%;
        margin: 0 auto;
        padding: 60px 0;
    }
    .index-about-bg{
        display: none;
    }
    .index-about-img {
        width: 100%;
        height: calc((800 / 1000) * 550px);
    }
    .index-about-text-box{
        width: 100%;
        padding: 0;
        padding-top: 30px;
    }
}
@media only screen and (max-width: 550px){
    .index-about-box{
        padding: 40px 20px;
        padding-bottom: 20px;
    }
    .index-about-text{
        font-size: 16px;
        margin-top: 15px;
    }
    .index-about-text p{
        font-size: 18px;
    }
    .index-about-img {
        height: calc((800 / 1000) * (100vw - 40px));
    }
}


@media only screen and (min-width: 769px){
    .index-about-img,
    .index-about-bg,
    .index-about-text{
        opacity: 0;
    }
    .index-about-img.anima{
        animation: fade 1.2s ease 0s 1 both;
    }
    .index-about-bg.anima{
        animation: fadeInRight 1.2s ease 0s 1 both;
    }
    .index-about-text.anima{
        animation: fadeInDown 1.2s ease 0s 1 both;
    }
}